[clangd] Fix elog message when preamble build fails.

Reviewers: sammccall

Reviewed By: sammccall

Subscribers: ilya-biryukov, MaskRay, jkorous, arphaman, kadircet, usaxena95, cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D76429

clang-tools-extra/clangd/Preamble.cpp

@@ -162,7 +162,7 @@ buildPreamble(PathRef FileName, CompilerInvocation &CI,
         SerializedDeclsCollector.takeMacros(), std::move(StatCache),
         SerializedDeclsCollector.takeCanonicalIncludes());
   } else {
-    elog("Could not build a preamble for file {0} version {2}", FileName,
+    elog("Could not build a preamble for file {0} version {1}", FileName,
          Inputs.Version);
     return nullptr;
   }